Iec 60873 2 2004

INTERNATIONAL STANDARD IEC 60873 2 First edition 2004 01 Electrical and pneumatic analogue chart recorders for use in industrial process control systems – Part 2 Guidance for inspection and routine te[.]

INTERNATIONAL STANDARD

IEC 60873-2

First edition 2004-01

Electrical and pneumatic analogue chart recorders for use in industrial process control systems –

Part 2:

Guidance for inspection and routine testing

Reference number IEC 60873-2:2004(E)

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INTERNATIONAL STANDARD

IEC 60873-2

First edition 2004-01

Electrical and pneumatic analogue chart recorders for use in industrial process control systems –

Part 2:

Guidance for inspection and routine testing

 IEC 2004  Copyright - all rights reserved

No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher

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ELECTRICAL AND PNEUMATIC ANALOGUE CHART RECORDERS

FOR USE IN INDUSTRIAL PROCESS CONTROL SYSTEMS –

Part 2: Guidance for inspection and routine testing

FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees) The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields To

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8) Attention is drawn to the Normative references cited in this publication Use of the referenced publications is

indispensable for the correct application of this publication

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights IEC shall not be held responsible for identifying any or all such patent rights

International Standard IEC 60873-2 has been prepared by subcommittee 65B: Devices, of IEC

technical committee 65: Industrial-process measurement and control

The text of this standard is based on the following documents:

FDIS Report on voting 65B/513/FDIS 65B/520/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2

60873-2  IEC:2004(E) – 3 –

The committee has decided that the contents of this publication will remain unchanged until

2009 At this date, the publication will be

• reconfirmed;

• withdrawn;

• replaced by a revised edition, or

• amended

ELECTRICAL AND PNEUMATIC ANALOGUE CHART RECORDERS

FOR USE IN INDUSTRIAL PROCESS CONTROL SYSTEMS –

Part 2: Guidance for inspection and routine testing

1 Scope and object

This part of IEC 60873 applies to electrical and pneumatic analogue chart recorders (for use in

industrial-process control systems), operating from a standardized signal which may be used in

process control It is intended that continuous and dotted line traces, and multiple pen and

multiple-channel instruments should be covered Some tests may not apply to all instruments

and additional tests may be required for certain types of recorders

The object of this standard is to provide technical guidance for inspection and routine testing of

electrical and pneumatic analogue chart recorders, for instance, as acceptance tests or after

repair For a full evaluation, or where a recorder is to be used under arduous conditions, (for

example, high temperatures), IEC 60873-1 should be used Whenever possible any tests

carried out are to be in accordance with IEC 61298, and the person carrying out the tests

needs to have a copy of it to hand and be familiar with it

Quantitative criteria for acceptable performance should be established by agreement between

manufacturer and user, and the report on the tests shall make clear which tests were carried

out The requirements of this standard shall be effective when agreed by the manufacturer and

the user

2 Normative references

The following referenced documents are indispensable for the application of this document For

dated references, only the edition cited applies For undated references, the latest edition of

the referenced document (including any amendments) applies

IEC 60410:1973, Sampling plans and procedures for inspection by attributes

IEC 60873-1, Electrical and pneumatic analogue chart recorders for use in industrial-process

control systems – Part 1: Methods for performance evaluation 1

IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control, and

laboratory use – Part 1: General requirements

IEC 61298 (all parts), Process measurement and control devices – General methods and

procedures for evaluating performance

———————

1 To be published

60873-2  IEC:2004(E) – 5 –

3 Terms and definitions

For the purposes of this document, the terms and definitions of IEC 60873-1, together with the

following, apply

3.1

acceptance test

test which intends to prove to the user that the device complies with certain conditions of its

requirements as they appear in the contract

4 Sampling for test

If, by agreement between user and manufacturer, tests are to be performed on a sample lot, it

is recommended that a sampling method such as that presented in IEC 60410 be selected

When sampling is used, recorders to be tested may be chosen by the user's inspector

5 Performance test

Environmental conditions at the location of testing shall be recorded (see 5.1 of IEC 60873-1)

Adjustments: For zero, span and damping, the routine tests shall be carried out with the final

manufacturing adjustments (for example, as an acceptance test) or with the adjustments

determined by the user (for example, after repair)

The following tests shall be performed unless another series of tests is agreed between user

and manufacturer

NOTE Ink and paper should be in accordance with the manufacturer's specifications A chart speed of

approximately 20 mm/h should preferably be used

5.1 Measured error and hysteresis (see Clause 6 of IEC 60873-1)

Prior to recording observations, the device under test shall be exercised by three full-range

traverses in each direction The input-output characteristic under reference conditions shall be

measured in one measurement cycle traversing full range in each direction For this, at least

five points of measurements should be distributed over the range, for example, in steps of

25 % from 0 % to 100 % and then from 100 % to 0 % Tapping or vibrating the instrument

under test is not allowed, unless otherwise stated

Adjust the input to bring the output to the required value Measure the input at this level and

determine the difference between this input and the specified input to give this output value As

the result, report the difference as "measured error including hysteresis" expressed in per cent

of input span

NOTE For this test, measured error is defined as the greatest positive or negative error in the measuring cycle

Hysteresis (including deadband) is defined as the greatest difference between upscale and downscale readings

which are determined at each value of output

5.2 Effects of influence quantities

5.2.1 Power supply variations (see 12.1 of IEC 61298-3)

Adjust the input signal to bring the output to approximately 95 % of span Measure and report

the change of input that is necessary to bring the output level to its original value in % of span

at the following variations in power supply or at the manufacturer's stated limits, if smaller:

– voltage variation = +10 %, –15 % of nominal a.c or +20 %, –15 % of nominal d.c voltage;

– supply pressure variation = +10 % –15 % of nominal supply pressure (see 12.8 of

IEC 61298-3)

5.2.2 Over-range (see Clause 10 of IEC 61298-3)

With the input adjusted to bring the output first to approximately 5 % and then to approximately

95 % span, note the input levels

The input shall then be increased gradually to the maximum overrange specified by the

manufacturer After the over-range has been applied for 1 min, the input shall be reduced to

the nominal lower range value After a further 5 min have elapsed, using the same output

values as before, determine the changes required in input values to bring the output back to

the originally used values

The changes in input determined after over-ranging shall be reported, expressed as per cent

input span

NOTE If over-ranging produces significant thermal effects, the duration of application should be increased

accordingly

5.3 Recording quality

The instrument shall be connected as for normal operation and an alternating input applied with

a peak-to-peak amplitude equal to half the span and centred at the mean of the upper and

lower range input values The frequency selected shall be such that all recorded traces can be

clearly distinguished (not more than 1 cycle per millimeter chart travel)

After an appropriate number of traverses it shall be noted

a) whether all traces are without interruption of the ink flow;

b) whether the widths of the recorded lines change during the test;

c) for multi-channel recorders, whether the ink colours change over a longer distance than

5 mm after crossing different colour traces

5.4 Paper speed

With the chart-drive operating as normal, check by observing over a suitable period of time that

the paper speed is within specification

5.5 Step response

With the chart being driven at its fastest selectable speed, apply a suitably large step change

of input signal and check that the step response of the pen mechanism is within specification

6 Safety

The instrument shall be checked against the requirements of IEC 61010-1

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